Product Description Multi-functional Bluetooth control allows direct control of music playback, volume, and Siri on your smartphone or tablet via the steering wheel, enhancing driving convenience and safety. Wireless camera shutter doubles as a remote shutter for your device's camera, allowing you to easily take natural selfies and group photos without awkwardly stretching your arm. Energy-saving and power-efficient design with a 0.5-second quick wake-up and up to 2 years of standby time ensures sustained performance. Automatic sleep mode automatically enters sleep mode after 30 seconds of inactivity to save power; easily wakes up by pressing any button. Wide compatibility with iOS 7.0 and Android 4.4+ devices, suitable for a variety of smartphones and tablets. Compact design with a diameter of 36 mm and a thickness of 8.5 mm, this stylish controller is inconspicuous when mounted on the steering wheel. Product Specifications: Bluetooth Range: 10 meters Dimensions: 36 mm in diameter, 8.5 mm in thickness Battery Type: CR2032 (included) Compatibility: iOS 7.0 or Android 4.4+ Material: ABS Standby Time: Up to 2 years Wake-up Time: 0.5 seconds